The Karnataka Examination Authority (KEA) is responsible for conducting the counselling for MBBS/BDS seats for government and private colleges on the basis of marks obtained in NEET 2020. The tentative dates of counselling have also been announced. According to all that I have read, there is no correction window provided by the KEA. If it was there, you could have uploaded the documents there. You can contact the authorities and try to register again, or you can wait and check the official website for updates about the correction window.